DOI: 10.1111/gcb.12819
论文题名: Soil warming and CO<inf>2</inf> enrichment induce biomass shifts in alpine tree line vegetation
作者: Dawes M.A. ; Philipson C.D. ; Fonti P. ; Bebi P. ; Hättenschwiler S. ; Hagedorn F. ; Rixen C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 5 起始页码: 2005
结束页码: 2021
语种: 英语
英文关键词: Dwarf shrub
; European larch
; Free air CO2 enrichment
; Global change
; Larix decidua
; Mountain pine
; Pinus uncinata
Scopus关键词: aboveground biomass
; alpine environment
; atmospheric chemistry
; biomass
; biomass allocation
; carbon dioxide
; enrichment
; global change
; soil temperature
; vegetation cover
; warming
; Bryophyta
; Larix
; Larix decidua
; Pinus mugo
; Pinus uncinata
; Vaccinium myrtillus
; carbon dioxide
; soil
; biomass
; greenhouse effect
; growth, development and aging
; Larix
; pine
; soil
; species difference
; statistical model
; Switzerland
; temperature
; tundra
; Biomass
; Carbon Dioxide
; Global Warming
; Larix
; Models, Statistical
; Pinus
; Soil
; Species Specificity
; Switzerland
; Temperature
; Tundra
英文摘要: Responses of alpine tree line ecosystems to increasing atmospheric CO2 concentrations and global warming are poorly understood. We used an experiment at the Swiss tree line to investigate changes in vegetation biomass after 9 years of free air CO2 enrichment (+200 ppm; 2001-2009) and 6 years of soil warming (+4 °C; 2007-2012). The study contained two key tree line species, Larix decidua and Pinus uncinata, both approximately 40 years old, growing in heath vegetation dominated by dwarf shrubs. In 2012, we harvested and measured biomass of all trees (including root systems), above-ground understorey vegetation and fine roots. Overall, soil warming had clearer effects on plant biomass than CO2 enrichment, and there were no interactive effects between treatments. Total plant biomass increased in warmed plots containing Pinus but not in those with Larix. This response was driven by changes in tree mass (+50%), which contributed an average of 84% (5.7 kg m-2) of total plant mass. Pinus coarse root mass was especially enhanced by warming (+100%), yielding an increased root mass fraction. Elevated CO2 led to an increased relative growth rate of Larix stem basal area but no change in the final biomass of either tree species. Total understorey above-ground mass was not altered by soil warming or elevated CO2 . However, Vaccinium myrtillus mass increased with both treatments, graminoid mass declined with warming, and forb and nonvascular plant (moss and lichen) mass decreased with both treatments. Fine roots showed a substantial reduction under soil warming (-40% for all roots <2 mm in diameter at 0-20 cm soil depth) but no change with CO2 enrichment. Our findings suggest that enhanced overall productivity and shifts in biomass allocation will occur at the tree line, particularly with global warming. However, individual species and functional groups will respond differently to these environmental changes, with consequences for ecosystem structure and functioning. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61906
Appears in Collections: 影响、适应和脆弱性
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作者单位: WSL Institute for Snow and Avalanche Research - SLF, Flüelastrasse 11, Davos Dorf, Switzerland; Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf, Switzerland; Ecosystem Management, Institute of Terrestrial Ecosystems, ETH Zurich, Zurich, Switzerland; Centre d'Ecologie Fonctionnelle and Evolutive (CEFE UMR 5175), CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE, 1919 route de Mende, Montpellier Cedex 5, France
Recommended Citation:
Dawes M.A.,Philipson C.D.,Fonti P.,et al. Soil warming and CO<inf>2</inf> enrichment induce biomass shifts in alpine tree line vegetation[J]. Global Change Biology,2015-01-01,21(5)